Steam-boiler.



No. 767,924. PATENTED AUG. 16, 1904. F. BURGER & H. M. WILLIAMS.

STEAM BOILER.

APPLICATION FILED DEC. 26, 1902.

N0 MODEL. 2 SHEETS-SHEET 1.

No. 767,924. PATENTED AUG. 16, 1904. I. BURGER & H. M. WILLIAMS.

STEAM BOILER.

APPLICATION FILED DEC. 26, 1902.

' UNITED STATES;

Patented August 16, 1904.

PATENT OFFICE.

FRANZ BURGER AND HENRY M. WILLIAMS, OF FORT WAYNE, INDIANA;

SAID BURGER ASSIGNOR OF ONE-HALF OF HIS RIGHT TO SAID VVIL- LIAMS.

STEAIVI 'BOILER.

SPECIFICATION forming part of Letters Patent No. 767,924, dated August16, 1904.

Application filed December 26, 1902. Serial No. 136,719. (No model.)

To all whom, it may concern.-

Be it known that we, FRANZ BURGER and HENRY M. WILLIAMS, citizens of theUnited States, residing at Fort Wayne, in the county of Allen andState'of Indiana, have invented certain new and useful Improvements inSteam-Boilers, of which the following is a specification.

This invention relates to steam-boilers; and the object of the inventionis to utilize the products of combustion for heating the feedwater andsuperheating the steam in addition to heating the water in the boiler.

The invention will be fully described hereinafter, reference being hadto the accompanying drawings, in which Figure 1 is a vertical transversesection of a boiler and furnace embodying our invention. Fig. 2 is aside elevation, partly in section and partly broken away. Fig. 3 is anend view of the boiler and a sectional'view of the water-jacket,particularly intended to show the construction of the water-jacket andthe manner of connecting it to or removing it from the boiler.

The boiler consists of two outer semicylindrical shells A and B,connected together at their longitudinal edges by channel-irons O in anysuitable manner, and two similar but smaller shells a and Z), connectedtogether at their longitudinal edges by channel-irons c, and the spacebetween these inner and outer shells forms the steam and water spaces ofthe boiler, and the space inclosed by the inner shells forms thefire-box or furnace of the boiler. The lower portions of the inner andouter shells are cut away to form a longitudinal slot, in which areplaced grate-bars (Z for supporting fuel. An opening is cut in the topof the outer shell A to afford communication with the usual steam-domeL.

In the construction illustrated the furnace extends substantially thewhole length of the boiler, and any means may be employed to furnishfuel to the furnace. Thus, as shown, there is a tube p on each side ofthe boiler in which a screw conveyer q rotates to move fuel along saidtube from a source of supply,

(not shown,) and from the tubes 2 a series of downwardly inclined tubes8 lead through the shells of a water-jacket and the shells of the boilerto discharge into the furnace at intervals in its length, thimbles 7 and7 being secured in the shells of the jacket and boiler, respectively,through which the tubes 8 pass. The special fuel-feeding mechanism,however, forms no part of our present invention; nor is the latterdependent upon any special means for feeding fuel to the furnace.

P indicates a Water-jacket surrounding the boiler to leave a space 8between them. This water-jacket may be constructed in various ways; butpreferably it is made in two halves, adapted to be secured togetherlongitudinally of the boiler. Each half is preferably made of twosections. each formed of an outer curved plate 1 and an inner curvedplate 2, connected to each other by channel-irons 5, which may beriveted or otherwise secured to the plates. An L-shaped distance-piece 3is fitted between the plates 1 and 2 of the upper sections at theirupper ends, and these distance-pieces are provided with holes for thepassage of bolts 11, by means of which the two halves are securedtogether at their upper edges. Distance-pieces 4 are fitted between theplates 1 and 2 of the lower sections, each piece having a series ofthreaded studs 12, which extend through openings indownwardly-projecting plates 6, secured to the boiler, and nuts on thestuds will securely clamp the lower ends of the lower sections to theboiler. Each half of the waterjacket is divided into two chambers bychannel-irons 9, and the two upper chambers are connected by a pipedetachably secured to the chambers, the points of connection beingindicated by 18 and 19 in Fig. 3. A water-supply pipe 17 will deliverwater under pressure to one of the chambers 10, and it will flow throughsaid connecting-pipe to the other chamber 10. Each chamber 10 isconnected to the lower chamber 10 of its half of the water- .jacket by apipe 20, having an upwardly-closportion of the water-space of the boilerby one or more pipes 22.

As before stated, one of the objects of our invention is to heat thefeed-water, and to accomplish this in the most effectual manner it isdesirable to subject as much as possible of the surface of the water-jacket to the action of the products of combustion, and in the presentcase we provide means for causing all the hot gases from the furnace topass into the spaces 8 at their lower ends and then pass upwardly incontact with the inner surface of the waterjacket to the smoke-outlet,which in the present instance is located about midway the length of theboiler, as indicated by K. Various means may be devised for carryingoutthis feature of our invention; but preferably we provide a series ofpassages Gr, leading from near the bottom of the furnace to the spaces8, and as there is no other exit for the products of combustion from thefurnace they must all escape through these passages up over themnersurface of the water-jacket and the outer surface of the boiler to therestricted outlet K, and most of their heat will be imparted to thewater in the jacket and boiler. In order to insure passage of theproducts of combustion through the passages G, two guard-walls H areprovided, one on eachside of the grate area, which extend above theopenings to the passages G and effectually prevent the fuel from chokingup the passages and also insure that the products of combustion will notpass directly into the passages G, and they will take the general courseindicated by the arrows in Fig. 1. To still further increase the heatingeffect upon the water in the boiler, we provide a series of horizontaltubes R, extending across the furnace at the junction of the upper andlower shells of the boiler, and these tubes also serve as a protectionfor stay-rodsl3, which extend through them and the shells of the boilerand water-jacket and assist in holding the several parts together,washers, nuts, and screw-plugs being employed where necessary to insuretight joints. Thus at the junction of the upper and lower sections ofthe waterjackets a series of thimbles 13 are secured in thechannel-irons 5 opposite the tubes R,which latter are expanded into thechannel-ironsc and communicate at each end with the waterspace of theboiler. A series of tubular screwplugs a" are screwed into thechannel-iron C opposite the tubes R, and the rods 13 extend through thethimbles 6, plugs 00, and the tubes R. Washers 16 close the outer endsof the thimbles 6, and nuts 11 on the ends of the rod bear against thesewashers. Washers 14: surround the rods 13' and bear against the plugs:11; and are clamped in place by nuts 15. By removing the nuts from thebolts 11, threaded studs 12, and from the ends of the rods 13 either orboth halves of the water-jacket can be removed from the boiler, it beingunderstood, of course, that the fuel-feeding devices will have beenremoved and pipes 22 and pipe connection between the chambers 10disconnected.

Means for superheating the steam are also provided, consisting of twoheaders 26, one at each end of the space 8, which are connected to eachother by a series of longitudinally-extending tubes 25, arranged in thespace 8 on each side of the dome L. One of the headers 26 is connectedby a pipe 51 to the steam-dome, and the other header has a pipe 52leading from it to convey the superheated steam to an engine. from thedome to one'of the headers 26, thence through the tubes 25 to the otherheader, and as the products of combustion circulate around the headersand pipes the steam will be superheated.

Any suitable means may be provided for fur nishing draft to the furnace,and in the present case we have illustrated two longitudinally-extendingpipes 53 and 5 1, connected by a series of transverse pipes 55 below thegratebars, each pipe 55 having a series of upwardlydischarging nipples56. Air under pressure will be supplied to the pipes 53 and 54L and bedischarged through the nipples 56 through the grate into the fuel.

Obviously some features of our invention may be used without others, andthe structural details and arrangement of the parts may be variedwithout departing from the spirit of our invention.

Therefore without limiting ourselves to the precise details ofconstruction illustrated and described,we claim 1. The combination witha boiler, and its furnace, of a two-part water-jacket inclosing the sameto leave a space'between the jacket and the boiler, connections betweenthe interior of the water-jacket and the boiler, and means forintroducing the products of combustion from the furnace to the lowerportion of the space between the boiler and jacket and for dischargingthem from the upper portion of the space, substantially as set forth.

2. The combination with a boiler, and its furnace, of a two-partwater-jacket inclosing the same to leave a space between the jacket andthe boiler, connections between the interior of the water-jacket and theboiler, and means for introducing the products of combustion from thefurnace to the lower portion of the space between the boiler and jacketand for discharging them through a restricted outlet at the upperportion of the space, substantially as set forth.

(Not shown.) The steam will pass IIO 3. The combination of a furnace,aboiler innace being closed against exit of the products of combustionexcept through said passages, substantially as set forth.

4. The combination of a furnace, a boiler inclosing the furnace, awater-jacket inclosing the boiler with a space between them, connectionsbetween the waterjacket and boiler, means for feeding water to thejacket,passages leading from the lower portion of the furnace to thelower portion of the space for the passage of the products ofcombustion, from the furnace to said space, a restricted outlet at theupper portion of said space, and guard-walls between the grate area ofthe furnace and said passages and extending above said passages,substantially as set forth.

5. The combination of a furnace, a boiler inclosing the furnace,tubes Rextending across the furnace and communicating at each end with thewater-space of the boiler, a waterjacket inclosing the boiler with aspace between them, means for introducing the products of combustionfrom the furnace to said space, and stay-rods extending through thejacklet, boiler and tubes R, substantially as set fort 1.

6. The combination with a boiler and its furnace, of a water-jacketinclosing the same to leave a space between the jacket and the boiler,said jacket being divided to form upper and lower chambers, meansforfeeding water to the upper chamber, an upwardlyclosing check-valvebetween the upper and lower chamber, connections between the lower chamber and the boiler, and means for introducing the products of combustionfrom the furnace to the said space to heat the water in said jacket,substantially as set forth.

7. The combination with a boiler and its furnace of a water-jacketinclosing the same to leave aspace between them, said jacket beingformed of two vertically-separable parts, and means for detachablysecuring said parts to each other and to the boiler, substantially asset forth.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing Witnesses.

FRANZ BURGER. HENRY M. WILLIAMS.

Witnesses:

GEO. D. CRANE, O. ERVIN.

